Cooking Directions

Step 1

Heat oil in a small nonstick skillet over medium heat. Add onion and cook, stirring, until it begins to soften, about 1 minute. Add egg whites, salt and capers (if using) and cook, stirring constantly, until whites are set, about 30 seconds.

Step 2

To make the sandwich, layer the egg whites, smoked salmon and tomato on English muffin.